<template slot-scope="scope">
    <div>
       <!--面包屑导航区域-->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
        <!-- 警告区域 -->
            <el-alert show-icon title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false"></el-alert>
        <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联选择框 -->
                    <el-cascader
                    :options="cateList"
                    :props="cateProps"
                    v-model="selectedKeys"
                    @change="handleChange">
                    </el-cascader>
                </el-col>
            </el-row>
            <!-- tab页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数的按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                    <!-- 展开行 -->
                     <el-table-column  type="expand">
                        <template slot-scope="scope">
                        <!-- 循环渲染Tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                            <!-- 输入文本框 -->
                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)">
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)" >+ New Tag</el-button>
                        </template>
                        
                     </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">
                                    编辑
                                </el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">
                                    删除
                                </el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加属性的按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                    <!-- 静态属性表格 -->
                    <el-table :data="onlyTableData" border stripe>
                    <!-- 展开行 -->
                      <el-table-column  type="expand">
                        <template slot-scope="scope">
                        <!-- 循环渲染Tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                            <!-- 输入文本框 -->
                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)">
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)" >+ New Tag</el-button>
                        </template>
                     </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">
                                    编辑
                                </el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">
                                    删除
                                </el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加参数的对话框 -->
        <el-dialog
        :title="'添加'+titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDialogClosed">
        <!-- 添加参数的对话框 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
         </span>
        </el-dialog>
        <!-- 修改参数的对话框 -->
        <el-dialog
        :title="'添加'+titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        >
        <!-- 添加参数的对话框 -->
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
         </span>
        </el-dialog>
    </div>
</template>
<script>
    export default {
        data(){
            return{
                //商品分类列表
                cateList:[],
                //级联选择器的配置对象
                cateProps:{
                    expandTrigger: 'hover',
                    value:'cat_id',
                    label:'cat_name',
                    children:'children'
                },
                // 级联选择器双向绑定的数组
                selectedKeys:[],
                // 被激活的页签的名称
                activeName:'many',
                // 动态参数的数据
                manyTableData:[],
                // 静态属性的数据
                onlyTableData:[],
                // 控制添加对话框的显示与隐藏
                addDialogVisible:false,
                // 添加参数的表单数据对象
                addForm:{
                    attr_name:''
                },
                // 添加表单的验证规则对象
                addFormRules:{
                    attr_name:[ 
                        {required:true,message:'请输入分类名称',trigger:'blur'}
                    ]
                },
                // 控制修改对话框的显示与隐藏
                editDialogVisible:false,
                // 修改的表单数据对象
                editForm:{},
                // 修改表单的验证规则对象
                editFormRules:{
                    attr_name:[ 
                        {required:true,message:'请输入分类名称',trigger:'blur'}
                    ]
                },
                

            }
        },
        created(){
            this.getCateList()
        },
        methods:{
            // 获取所有的商品分类列表
            async getCateList(){
                const {data:res}=await this.$http.get('categories')
                if(res.meta.status!==200){
                    return this.$message.error('获取商品分类失败！')
                }
                this.cateList=res.data
                console.log(this.cateList);
            },
            // 级联选择器框中项变化，触发函数
            handleChange(){
                this.getParamsData()
            },
            //tab 页签点击事件的处理函数
            handleTabClick(){
                console.log(this.activeName);
                this.getParamsData()
            },
            // 获取参数的列表数据
            async getParamsData(){
                // console.log(this.selectedKeys);
                // 证明选中的不是三级分类
                if(this.selectedKeys.length!==3){
                    this.selectedKeys=[]
                    this.manyTableData=[]
                    this.onlyTableData=[]
                    return
                }
                // 选中的是三级分类
                // console.log(this.selectedKeys);
                // 根据所选中分类的ID,和当前所处的面板，获取对应的参数
                const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
                console.log(res);
                if(res.meta.status!==200){
                    return this.$message.error('获取参数列表失败！')
                }
                res.data.forEach(item=>{
                    item.attr_vals=item.attr_vals ? item.attr_vals.split(','):[]
                    //控制文本框的显示与隐藏
                    item.inputVisible=false
                    // 文本框中输入的值
                    item.inputValue=''
                })
                // console.log(res.data);
                if(this.activeName==='many'){
                    this.manyTableData=res.data
                }else{
                    this.onlyTableData=res.data
                }
            },
            // 监听添加对话框的关闭事件
            addDialogClosed(){
                this.$refs.addFormRef.resetFields()
            },
            // 点击按钮，添加参数
            addParams(){
                this.$refs.addFormRef.validate(async valid=>{
                    if(!valid) return
                    const {data:res}=await this.$http.post(`categories/${this.cateId}/attributes`,{
                        attr_name:this.addForm.attr_name,
                        attr_sel:this.activeName
                    })
                    // console.log(res);
                    if(res.meta.status!==200){
                        return this.message.error('添加参数失败！')
                    }
                    this.$message.success('添加参数成功！')
                    this.addDialogVisible=false
                    this.getParamsData()
                })
            },
            // 点击按钮，展示修改对话框
            async showEditDialog(attr_id){
                // 查询当前参数的信息
                const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
                    params:{attr_sel:this.activeName}
                })
                console.log(res);
                if(res.meta.status!==200){
                    return this.$message.error('获取参数信息失败！')
                }
                this.editForm=res.data
                this.editDialogVisible=true
            },
            // 重置修改的表单
            editDialogClosedO(){
                this.$refs.editFormRef.resetFields()
            },
            // 点击按钮，修改参数信息
            editParams(){
                this.$refs.editFormRef.validate(async valid=>{
                    if(!valid) return
                    const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                        attr_name:this.editForm.attr_name,
                        attr_sel:this.activeName
                    })
                    if(res.meta.status!==200){
                        return this.$message.error('修改参数失败！')
                    }
                    this.$message.success('修改参数成功！')
                    this.getParamsData()
                    this.editDialogVisible=false
                })
            },
            // 根据id删除对应的参数项
            async removeParams(attr_id){
                const confirmResult=await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }).catch(err=>err)
                // 用户取消了删除的操作
                if(confirmResult!=='confirm'){
                    return this.$message.info('已经取消删除！')
                }
                // 删除的业务逻辑
                const {data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
                if(res.meta.status!==200){
                    return this.$message.error('删除参数失败！')
                }
                this.$message.success('删除参数成功！')
                this.getParamsData()
            },
            // 文本框失去焦点，或摁下 Enter 都会触发
            async handleInputConfirm(row){
                // console.log('ok');
                if(row.inputValue.trim().length===0){
                    row.inputValue=''
                    row.inputVisible=false
                    return
                }
                row.attr_vals.push(row.inputValue.trim())
                row.inputValue=''
                row.inputVisible=false
                // 需要发起请求，保存这次操作
                this.saveAttrVals(row)
            },
            // 将对attr_vals 的操作，保存到数据库
            async saveAttrVals(row){
                 const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                    attr_name:row.attr_name,
                    attr_sel:row.attr_sel,
                    attr_vals:row.attr_vals.join(',')
                })
                if(res.meta.status!==200){
                    return this.$message.error('修改参数项失败！')
                }
                this.$message.success('修改参数成功！')
            },
            // 点击按钮，展示文本输入框
            showInput(row){
                row.inputVisible=true
                // 让文本框自动获得焦点
                // nextTick 方法的作用，就是当页面上的元素被重新渲染之后，才会指定会调回函数中的代码
                this.$nextTick(_ => {
                    this.$refs.saveTagInput.$refs.input.focus();
                });
            },
            // 删除对应的参数可选项
            handleClose(i,row){
                row.attr_vals.splice(i,1)
                this.saveAttrVals(row)
            }
                
        },
        computed:{
            // 如果按钮需要被禁用，则返回true，否则返回false
            isBtnDisabled(){
                if(this.selectedKeys.length!==3){
                    return true
                }
                return false
            },
            // 当前选择的三级分类的Id
            cateId(){
                if(this.selectedKeys.length===3){
                    return this.selectedKeys[2]
                }
                return null
            },
            // 动态计算标题的文本
            titleText(){
                if(this.activeName==='many'){
                    return '动态参数'
                }
                return '静态属性'
            }

        }
    }
</script>
<style lang="less" scoped>
.cat_opt{
    margin: 15px 0;
}
.el-tag{
    margin: 10px;
}
.input-new-tag {
    width: 120px;
}
</style>